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03-15-2011, 09:16 AM   #1
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Sigma 135-400

I have a sigma 170-500 that is a little soft, and am thinking of
the 135-400 for the lighter weight. Does anyone have any
experience with this lens? And does the DG model have lens
lock. The 170-500 does'nt. Major pain.
Thanks

03-15-2011, 09:31 AM   #2
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I have the 135-400 and find it on the soft side when at 400. I have lots of sharp images at 200.

I've ordered the DA* 60-250 F4 just to get that better sharpnest.

Dave
03-15-2011, 11:15 AM   #3
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QuoteOriginally posted by Dma110 Quote
I have a sigma 170-500 that is a little soft, and am thinking of
the 135-400 for the lighter weight. Does anyone have any
experience with this lens? And does the DG model have lens
lock. The 170-500 does'nt. Major pain.
Thanks
Hi, I don't know of the Sigma 135-400mm, but the Sigma 120-400mm has been discussed at length here:
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/111621-sigma-1...tried-yet.html

You can look up several examples in that thread.

The general conclusion is that this is not sharp lens.
You are better of buying a DA*60-250mm (much sharper) or a Sigma 50-500mm (sharper).

Hope this helps.

- Bert
03-15-2011, 01:12 PM   #4
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Thanks guys. I'll cross this off my list

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